Experimental Organic Chemistry: A Miniscale & Microscale Approach (Cengage Learning Laboratory Series for Organic Chemistry)
6th Edition
ISBN: 9781305080461
Author: John C. Gilbert, Stephen F. Martin
Publisher: Brooks Cole
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Question
Chapter 3.2, Problem 3E
Interpretation Introduction
Interpretation:Whether recrystallization is appropriate to be performed for situations or not should be explained.
Concept introduction:Recrystallization is technique that is used for purification of organic compounds. This process includes dissolution of solid in specific solvent at high temperature and then crystals are made again by process of cooling. Temperature of crystals is decreased to allow impurities to remain in solution only.
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Describe a procedure "fix" to solve the following recrystallization problems:
A. No crystals are formed when the solution reaches room temperature.
B. Colored impurities are present.
C. Crystals are left on the filter paper during gravity filtration.
6. In a recrystallization, why is it important to dissolve the solute in boiling
solvent instead of cold solvent?
a. To melt the solute
b. To boil the solute
c. To use as small amount of solvent to dissolve the solute as possible
d. To chemically decompose the impurities
Chapter 3 Solutions
Experimental Organic Chemistry: A Miniscale & Microscale Approach (Cengage Learning Laboratory Series for Organic Chemistry)
Ch. 3.2 - Prob. 1ECh. 3.2 - Prob. 2ECh. 3.2 - Prob. 3ECh. 3.2 - Prob. 4ECh. 3.2 - Prob. 5ECh. 3.2 - Prob. 6ECh. 3.2 - Prob. 7ECh. 3.2 - Prob. 8ECh. 3.2 - Prob. 9ECh. 3.2 - Prob. 10E
Ch. 3.2 - Prob. 11ECh. 3.2 - Prob. 12ECh. 3.2 - Prob. 13ECh. 3.2 - Prob. 14ECh. 3.2 - Prob. 15ECh. 3.2 - Prob. 16ECh. 3.2 - Prob. 17ECh. 3.2 - Prob. 18ECh. 3.2 - Prob. 19ECh. 3.2 - Prob. 20ECh. 3.2 - Prob. 21ECh. 3.2 - Prob. 22ECh. 3.2 - Prob. 23ECh. 3.2 - Prob. 24ECh. 3.2 - Prob. 25ECh. 3.2 - Prob. 26ECh. 3.2 - Prob. 27ECh. 3.2 - Prob. 28ECh. 3.2 - Prob. 29ECh. 3.2 - Prob. 30ECh. 3.2 - Prob. 31ECh. 3.2 - Prob. 32ECh. 3.2 - Prob. 34ECh. 3.3 - Prob. 1ECh. 3.3 - Prob. 2ECh. 3.3 - Prob. 3ECh. 3.3 - Prob. 4ECh. 3.3 - Prob. 5ECh. 3.3 - Prob. 6ECh. 3.3 - Prob. 7ECh. 3.3 - Prob. 8ECh. 3.3 - Prob. 10ECh. 3.3 - Prob. 11ECh. 3.3 - Prob. 12ECh. 3.3 - Prob. 13ECh. 3.3 - Prob. 14ECh. 3.3 - Prob. 15ECh. 3.3 - Prob. 16ECh. 3.3 - Prob. 17ECh. 3.3 - Prob. 18ECh. 3.3 - Prob. 19ECh. 3.3 - Prob. 21ECh. 3.3 - Prob. 22ECh. 3.3 - Prob. 23ECh. 3.3 - Prob. 24ECh. 3.3 - Prob. 25ECh. 3.3 - Prob. 26E
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- In fractional distillation, liquid can be seen running from the bottom of the distillation column back into the distilling flask. What effect does this returning condensate have on the fractional distillation?arrow_forward13. How can you induce recrystallization in a solution? a. Scratch inside of beaker with glass rod b. Cool solution c. Seed the solution with pure compound d. Concentrate the solution to create supersaturation e. All of the above Your answer:arrow_forwardBriefly explain why crystals form as the solvent cools during recrystallization.arrow_forward
- 2. When performing the recrystallization of an impure solid, why is it advised to use the minimal amount of solvent possible? Group of answer choices To minimize the amount of pure solid lost due to its solubility. To minimize the cost of the recrystallization. To reduce the time needed to filter the pure solid from the solvent after recrystallization. To minimize the amount of hazardous materials used.arrow_forwardA rubbing alcohol sample composed of 60% isopropyl alcohol and water was distilled using a simple distillation setup. If the temperature reading is 100°C, what is the composition of the distillate? a. Pure isopropyl alcoholb. Pure waterc. Cannot be determinedd. Water and isopropyl alcoholarrow_forwardArrange the ff. into the correct order of recrystallization: a. prepare hot solution b. slow cooling c. cold filtration d. hot filtrationarrow_forward
- Which of the following statements is true when considering temperature during a recrystallization? More than one answer may be correct. Using ice to cool the sample will speed up the crystallization process so that large crystals will be formed. It is important that the sample is dissolved in just enough hot solvent. O Ideally the hot solvent used will keep the impurities dissolved OR not dissolve them at all. Enough cold solvent should be added to dissolve the sample BEFORE heating it past its boiling point.arrow_forward52. In an extraction using two-solvent system, methanol can be used to decrease the solubility of the non-polar component. This technique in reducing the solubility of organic solutes by saturating the mixture is called "Salting-out effect". O "Saturation Process" O "Distillation Process"arrow_forwardBased on the melting point of your impure solid, you look at the given samples and believe you havecompound A. Compound A is recrystallized using a mixed solvent system of ethanol and water. You add1 ml of hot ethanol to your sample and it doesn’t completely dissolve. You continue to add hot ethanolbut there isn’t any change. Some solid remains. What should you do next?arrow_forward
- When performing a recrystallization of an impure solid, why is it important to allow the heated solution to cool slowly? Group of answer choices To encourage greater solid solubility. For the molecules of the solid being purified to arrange in organized crystal lattices. To avoid the need for using ice to cool the solution. To trap particles in the crystal lattice.arrow_forwardIn a mixed solvent system, what is the role of the "poor" solvent? a.to DECREASE the solubility of the solute in the good solvent and saturate the solution b. to INCREASE the solubility of the solute in the good solvent and saturate the solution c. to DECREASE the boiling point of the mixturearrow_forwardWhat will happen if the recrystallization mixture is cooled very quickly so that crystals form very rapidly? small pure crystals will form the impurities will stay in solution small impure crystals will form O large impure crystals will formarrow_forward
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